From a64ffd7ffc5cc28cabecd51e96102d3e830709b5 Mon Sep 17 00:00:00 2001
From: Holden Rohrer <hr@hrhr.dev>
Date: Fri, 15 May 2020 16:51:02 -0400
Subject: added AP CSA answers

---
 ap-computer-science-a-exam/QuestionOne.java | 82 +++++++++++++++++++++++++++++
 ap-computer-science-a-exam/q1.txt           | 40 ++++++++++++++
 ap-computer-science-a-exam/q2.txt           | 28 ++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 ap-computer-science-a-exam/QuestionOne.java
 create mode 100644 ap-computer-science-a-exam/q1.txt
 create mode 100644 ap-computer-science-a-exam/q2.txt

diff --git a/ap-computer-science-a-exam/QuestionOne.java b/ap-computer-science-a-exam/QuestionOne.java
new file mode 100644
index 0000000..3b61fab
--- /dev/null
+++ b/ap-computer-science-a-exam/QuestionOne.java
@@ -0,0 +1,82 @@
+import java.util.ArrayList;
+
+class Trial {
+    private int trialNum;
+    private double temperature;
+    private String compoundName;
+    private double amountUsed;
+    public Trial(int num, double temp, String compound, double amt){
+        trialNum = num;
+        temperature = temp;
+        compoundName = compound;
+        amountUsed = amt;
+    }
+    public int getTrialNum(){ return trialNum; }
+    public double getTemp(){ return temperature; }
+    public String getCompound(){ return compoundName; }
+    public double getAmtUsed(){ return amountUsed; }
+}
+
+class ScienceExperiment {
+    private ArrayList<Trial> trialList;
+    public double getCompoundAvg(String comp){
+        int ct = 0;
+        double totalTemp = 0;
+        for (Trial trial : trialList){
+            if (trial.getCompound() != comp) continue;
+            ct++;
+            totalTemp += trial.getTemp();
+        }
+        if (ct > 0) return totalTemp/ct;
+        else return -1;
+    }
+    public ArrayList<String> getCompoundList(){
+        ArrayList<String> out = new ArrayList<String>();
+        for (Trial trial : trialList){
+            if (!out.contains(trial.getCompound()))
+                out.add(trial.getCompound());
+        }
+        return out;
+    }
+    public String getCompoundWithHighestAvg(){
+        double max = -1; // less than all non-negative temperatures.
+        String compound = ""; // to make java behave
+        for (String curCompound : getCompoundList()){
+            double avg = getCompoundAvg(curCompound);
+            if (avg > max){
+                max = avg;
+                compound = curCompound;
+            }
+        }
+        return compound;
+    }
+    public void add(Trial trial){
+        trialList.add(trial);
+    }
+    public ScienceExperiment(){
+        trialList = new ArrayList<Trial>();
+    }
+    public double getCompoundAmountUsed(String compound){
+        double sum = 0;
+        for (Trial trial : trialList){
+            if (trial.getCompound() == compound)
+                sum += trial.getAmtUsed();
+        }
+        return sum;
+    }
+}
+
+public class QuestionOne {
+    public static void main(String[] args){
+        ScienceExperiment exp = new ScienceExperiment();
+        exp.add(new Trial(1,70,"alkynes",1));
+        exp.add(new Trial(27,100,"ketones",15));
+        exp.add(new Trial(29,80,"ketones",2));
+        exp.add(new Trial(35,90,"ethers",3));
+        System.out.println(exp.getCompoundAvg("alkynes"));
+        System.out.println(exp.getCompoundAvg("ketones"));
+        System.out.println(exp.getCompoundAvg("thiol"));
+        System.out.println(exp.getCompoundAmountUsed("ketones"));
+        System.out.println(exp.getCompoundWithHighestAvg());
+    }
+}
diff --git a/ap-computer-science-a-exam/q1.txt b/ap-computer-science-a-exam/q1.txt
new file mode 100644
index 0000000..fe2b68e
--- /dev/null
+++ b/ap-computer-science-a-exam/q1.txt
@@ -0,0 +1,40 @@
+WY5V8181
+HR
+
+(a) 
+
+public double getCompoundAvg(String comp){
+    int ct = 0;
+    double totalTemp = 0;
+    for (Trial trial : trialList){
+        if (trial.getCompound() != comp) continue;
+        ct++;
+        totalTemp += trial.getTemp();
+    }
+    if (ct > 0) return totalTemp/ct;
+    else return -1;
+}
+
+(b)
+
+public String getCompoundWithHighestAvg(){
+    double max = -1; // less than all non-negative temperatures.
+    String compound;
+    for (String curCompound : getCompoundList()){
+        double avg = getCompoundAvg(curCompound);
+        if (avg > max){
+            max = avg;
+            compound = curCompound;
+        }
+    }
+    return compound;
+}
+
+(c)
+
+The programmer would need to add the amount of compound used as a
+private instance variable (with a getter) in Trial (which would be
+initialized in its constructor). ScienceExperiment would hold the method
+`public double getCompoundAmountUsed(String compoundName)` which would
+sum, for all Trials in trialList with the same compoundName as given,
+the value of trial.getAmountUsed(), and return that value.
diff --git a/ap-computer-science-a-exam/q2.txt b/ap-computer-science-a-exam/q2.txt
new file mode 100644
index 0000000..d9ae2aa
--- /dev/null
+++ b/ap-computer-science-a-exam/q2.txt
@@ -0,0 +1,28 @@
+WY5V8181
+HR
+
+(a)
+
+public static boolean runSimulation(int sampleSize){
+    int half = sampleSize/2;
+    int halves[] = { 0, 0 };
+    for (int i = 0; i < 2; i++){
+        for (int j = 0; j < half; j++){
+            int num = getInt();
+            if (num > 0 && isTarget(num)) halves[i]++;
+        }
+    }
+    return (halves[0] > halves[1]);
+}
+
+(b)
+
+The programmer would, instead of using `int sampleSize` as a parameter,
+use a `public final static int sampleSize = $value` where $value is the
+value the programmer wants it to be so that it could be set at compile
+time. If the programmer wants it to be set at runtime instead, the
+programmer could use a basic class-wide declaration `private static int`
+and setter public static void setSampleSize(int size) which would only
+set the variable if it is non-null. Note that static is used for all
+variables and methods because the class does not appear to use
+instances.
-- 
cgit